Discussion
The upper speed limit of a conventional ramjet is set by
Answer: D
Correct answer: The temperature after full deceleration
A ramjet decelerates the captured air to subsonic speed before burning, so the combustor sees the stagnation temperature
\[ T_0 = T\left(1 + \frac{\gamma-1}{2}M^2\right) \]At Mach 5 from 220 K that is already 1320 K before any fuel is added; by Mach 8 it is over 3000 K, at which the structure cannot survive, the air begins to dissociate, and adding heat yields little further thrust. The limit is thermal, not structural or a matter of fuel supply, and it is precisely the limit the scramjet exists to escape.
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